<template>
  <div class="app">
    <h3>我是App组件（祖）,{{name}},{{price}}</h3>
    <Child />

  </div>

</template>
<script>
  import Child from "@/components/Child.vue";
  import {ref,reactive,toRefs,provide} from 'vue'
  export default {
    name: 'App',
    components:{Child},
    setup(){

      let car= reactive({
        name:'奔驰',
        price:'40W'
      })
      provide('car',car)//给自己的后代组件传递数据
      return {
        ...toRefs(car)
      }
    }



  }
</script>
<style>
.app{
  background-color: gray;
  padding: 10px;
}
</style>


